PhoneMobile phone coverage on the four networks (T-Mobile, Vodafone, E-Plus and o2) is excellent across the whole country. UMTS (3G data) and EDGE is also available but still somewhat limited to cities and urban areas.
If you stay for a long vacation, a prepaid phone card would be a good option. You can buy it from one of the mobile phone companies and easy to find a store in any major shopping area.
Alternatively, call shops, where you can make international calls at cheap rates. , are your best option to call internationally.
LanguageGerman is the official and predominant spoken language in Germany.  It is one of 24 official and working languages of the European Union,  and one of the three working languages of the European Commission.
All Germans learn English at school, so you should be able to get by with English in most places especially in the former West Germany. Many people--especially in the tourism industry and higher educated persons--also speak French, Russian or Spanish, but if you can't speak German, English remains your best bet. Even if one member of the staff doesn't speak English, you are likely to find someone who does and is more than willing to help you.
Entschuldigen Sie bitte. /Excuse me.
Danke. /Thank you.
Können Sie mir helfen?/Can you help me?
Sprechen Sie Englisch?/Do you speak English?
Entschuldigung. /Pardon me.
Das verstehe ich nicht. /I don't understand.
Bitte, sprechen Sie langsam. /Speak more slowly, please.
Wo ist die U-Bahn?/Where is the subway?
Ist das Trinkgeld inbegriffen?/Is the tip included?
Wieviel kostet das?/How much does that cost?
Gibt es hier eine öffentliche Telefonzelle?/Is there a public phone here?